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<h1 id="sec_name">
<span data-if="hdevelop" style="display:inline;">dev_clear_window</span><span data-if="c" style="display:none;">dev_clear_window</span><span data-if="cpp" style="display:none;">DevClearWindow</span><span data-if="dotnet" style="display:none;">DevClearWindow</span><span data-if="python" style="display:none;">dev_clear_window</span> (算子名称)</h1>
<h2>名称</h2>
<p><code><span data-if="hdevelop" style="display:inline;">dev_clear_window</span><span data-if="c" style="display:none;">dev_clear_window</span><span data-if="cpp" style="display:none;">DevClearWindow</span><span data-if="dotnet" style="display:none;">DevClearWindow</span><span data-if="python" style="display:none;">dev_clear_window</span></code> — Clear the contents of the active graphics window.</p>
<h2 id="sec_synopsis">参数签名</h2>
<div data-if="hdevelop" style="display:inline;">
<p>
<code><b>dev_clear_window</b>( :  :  : )</code></p>
</div>
<div data-if="c" style="display:none;">
<p>
<code>Herror <b>dev_clear_window</b>()</code></p>
<p>
<code>Herror <b>T_dev_clear_window</b>()</code></p>
</div>
<div data-if="cpp" style="display:none;">
<p>
<code>void <b>DevClearWindow</b>()</code></p>
<p>
<code>static void <a href="HWindow.html">HWindow</a>::<b>DevClearWindow</b>()</code></p>
</div>
<div data-if="com" style="display:none;"></div>
<div data-if="dotnet" style="display:none;">
<p>
<code>static void <a href="HOperatorSet.html">HOperatorSet</a>.<b>DevClearWindow</b>()</code></p>
<p>
<code>static void <a href="HWindow.html">HWindow</a>.<b>DevClearWindow</b>()</code></p>
</div>
<div data-if="python" style="display:none;">
<p>
<code>def <b>dev_clear_window</b>() -&gt; None</code></p>
</div>
<h2 id="sec_description">描述</h2>
<p><code><span data-if="hdevelop" style="display:inline">dev_clear_window</span><span data-if="c" style="display:none">dev_clear_window</span><span data-if="cpp" style="display:none">DevClearWindow</span><span data-if="com" style="display:none">DevClearWindow</span><span data-if="dotnet" style="display:none">DevClearWindow</span><span data-if="python" style="display:none">dev_clear_window</span></code> clears the contents of the active graphics window
including the history of the displayed iconic objects.
The output parameters that have been set for this window
via the context menu, the visualization parameters dialog, or the
appropriate operators (e.g., with <a href="dev_set_color.html"><code><span data-if="hdevelop" style="display:inline">dev_set_color</span><span data-if="c" style="display:none">dev_set_color</span><span data-if="cpp" style="display:none">DevSetColor</span><span data-if="com" style="display:none">DevSetColor</span><span data-if="dotnet" style="display:none">DevSetColor</span><span data-if="python" style="display:none">dev_set_color</span></code></a>,
<a href="dev_set_draw.html"><code><span data-if="hdevelop" style="display:inline">dev_set_draw</span><span data-if="c" style="display:none">dev_set_draw</span><span data-if="cpp" style="display:none">DevSetDraw</span><span data-if="com" style="display:none">DevSetDraw</span><span data-if="dotnet" style="display:none">DevSetDraw</span><span data-if="python" style="display:none">dev_set_draw</span></code></a>, etc.) remain unmodified.
</p>
<p>该算子 is equivalent to pressing the
<code>Clear</code> button of the active graphics window.
</p>
<p>A graphics window can be activated by calling <a href="dev_set_window.html"><code><span data-if="hdevelop" style="display:inline">dev_set_window</span><span data-if="c" style="display:none">dev_set_window</span><span data-if="cpp" style="display:none">DevSetWindow</span><span data-if="com" style="display:none">DevSetWindow</span><span data-if="dotnet" style="display:none">DevSetWindow</span><span data-if="python" style="display:none">dev_set_window</span></code></a> or by
pressing the <code>Activate</code> button in the tool bar of the selected
graphics window.
</p>
<h2 id="sec_attention">注意</h2>
<p>Using the code export feature of HDevelop, the code that is generated
for this operator may have a different behavior than the related
HALCON operator.
For a detailed description of the code export of HDevelop graphics
operators into the different programming languages see in the
<code>“HDevelop User's Guide”</code> the chapter <code>Code Export</code>
-&gt; <code>General Aspects of Code Generation</code>
-&gt; <code>Graphics Windows</code>.
</p>
<h2 id="sec_example_hdevelop">例程 (HDevelop)</h2>
<pre class="example">
read_image (Image, 'fabrik')
regiongrowing (Image, Regions, 3, 3, 6, 100)
Number := |Regions|
dev_update_window ('off')
for i := 1 to Number by 1
  select_obj (Regions, RegionSelected, i)
  dev_clear_window ()
  dev_display (RegionSelected)
  * stop ()
endfor
</pre>
<h2 id="sec_result">结果</h2>
<p><code><span data-if="hdevelop" style="display:inline">dev_clear_window</span><span data-if="c" style="display:none">dev_clear_window</span><span data-if="cpp" style="display:none">DevClearWindow</span><span data-if="com" style="display:none">DevClearWindow</span><span data-if="dotnet" style="display:none">DevClearWindow</span><span data-if="python" style="display:none">dev_clear_window</span></code> returns always <TT>2</TT> (
      <TT>H_MSG_TRUE</TT>)
    .</p>
<h2 id="sec_predecessors">可能的前置算子</h2>
<p>
<code><a href="dev_set_window.html"><span data-if="hdevelop" style="display:inline">dev_set_window</span><span data-if="c" style="display:none">dev_set_window</span><span data-if="cpp" style="display:none">DevSetWindow</span><span data-if="com" style="display:none">DevSetWindow</span><span data-if="dotnet" style="display:none">DevSetWindow</span><span data-if="python" style="display:none">dev_set_window</span></a></code>, 
<code><a href="dev_open_window.html"><span data-if="hdevelop" style="display:inline">dev_open_window</span><span data-if="c" style="display:none">dev_open_window</span><span data-if="cpp" style="display:none">DevOpenWindow</span><span data-if="com" style="display:none">DevOpenWindow</span><span data-if="dotnet" style="display:none">DevOpenWindow</span><span data-if="python" style="display:none">dev_open_window</span></a></code>, 
<code><a href="dev_display.html"><span data-if="hdevelop" style="display:inline">dev_display</span><span data-if="c" style="display:none">dev_display</span><span data-if="cpp" style="display:none">DevDisplay</span><span data-if="com" style="display:none">DevDisplay</span><span data-if="dotnet" style="display:none">DevDisplay</span><span data-if="python" style="display:none">dev_display</span></a></code>
</p>
<h2 id="sec_successors">可能的后置算子</h2>
<p>
<code><a href="dev_display.html"><span data-if="hdevelop" style="display:inline">dev_display</span><span data-if="c" style="display:none">dev_display</span><span data-if="cpp" style="display:none">DevDisplay</span><span data-if="com" style="display:none">DevDisplay</span><span data-if="dotnet" style="display:none">DevDisplay</span><span data-if="python" style="display:none">dev_display</span></a></code>
</p>
<h2 id="sec_see">参考其它</h2>
<p>
<code><a href="clear_window.html"><span data-if="hdevelop" style="display:inline">clear_window</span><span data-if="c" style="display:none">clear_window</span><span data-if="cpp" style="display:none">ClearWindow</span><span data-if="com" style="display:none">ClearWindow</span><span data-if="dotnet" style="display:none">ClearWindow</span><span data-if="python" style="display:none">clear_window</span></a></code>
</p>
<h2 id="sec_module">模块</h2>
<p>
Foundation</p>
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